/* Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * 
 *      http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.flowable.engine.repository;

import java.io.Serializable;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;
import java.util.Map.Entry;

/**
 * Stores a two-dimensional graph layout.
 * 
 * @author Falko Menge
 */
public class DiagramLayout implements Serializable {

    private static final long serialVersionUID = 1L;

    private Map<String, DiagramElement> elements;

    public DiagramLayout(Map<String, DiagramElement> elements) {
        this.setElements(elements);
    }

    public DiagramNode getNode(String id) {
        DiagramElement element = getElements().get(id);
        if (element instanceof DiagramNode) {
            return (DiagramNode) element;
        } else {
            return null;
        }
    }

    public DiagramEdge getEdge(String id) {
        DiagramElement element = getElements().get(id);
        if (element instanceof DiagramEdge) {
            return (DiagramEdge) element;
        } else {
            return null;
        }
    }

    public Map<String, DiagramElement> getElements() {
        return elements;
    }

    public void setElements(Map<String, DiagramElement> elements) {
        this.elements = elements;
    }

    public List<DiagramNode> getNodes() {
        List<DiagramNode> nodes = new ArrayList<>();
        for (Entry<String, DiagramElement> entry : getElements().entrySet()) {
            DiagramElement element = entry.getValue();
            if (element instanceof DiagramNode) {
                nodes.add((DiagramNode) element);
            }
        }
        return nodes;
    }

}
